Despite years of denials, disgraced Tour de France winner Floyd Landis is spilling his guts about his career-long use of blood doping and performance-enhancing drugs—and claiming that Lance Armstrong taught him how to do it.

Landis—who was stripped of his 2006 Tour de France win after a positive doping test—has sent emails to USA Cycling and the International Cycling Union, as well as the Wall Street Journal, that go into great detail about all the various ways he broke the rules. Even bigger than his own admission is the allegation that Lance Armstrong and his coach on the U.S. Postal Service team, Johan Bruyneel, instructed Landis on the methods of steroids use and the blood transfusions used to beat the test for the blood doping agent EPO, and that Armstrong himself used these procedures. No proof is offered, as of yet. Just the word of a man who has nothing left to lose.

So, yeah ... this is officially going to get ugly. No comment from Armstrong yet.